The above is indeed correct to my knowledge. Agency Service fees are very common if you want to get any degree of personal service.
But for tour packages to 'sun' destinations, here in Canada most tour operators pay 10% to 15%. Not sure about UK percentages, but considering how many Brits go to the south of Spain, etc. via MyTravel, FirstChoice, etc., it's a big part of travel ageny business there. Also as mentioned , "net fares" are big nowadays, even from tour operators. That's where the tour operator/wholesaler/airline prices it without commission and the agency marks it up for as much or little as they wish. Apparently many travel agencies rely on selling travel insurance as the commission there can be as high as 40%. Some website and toll free number agencies make their profit on insurance and add-ons and sell the actual air and hotel for close to cost.
That's why many travel agencies have focused on either business travellers (first class seats often still have commission built in) or leisure package tours. Trying to be all thing to everybody won't work anymore.
In Canada, AC
, like most network / legacy carriers pay close to 0% with "overrides" for some rare cases. WestJet still pays 5% to 9% for flights.
I've seen the future, I can't afford it. - Martin Fry